Sometimes less is more, so whether you have an allotment, a large kitchen garden or just a single raised bed
, you should use successional sowing to ensure a steady, regular and appropriate supply of vegetables throughout the growing season, rather than experiencing a glut all at once. Basically, using the principle of little and often, it involves extending your harvest by sowing a row every few weeks or so. Quick growing crops such as French beans, peas, spinach, salads and carrots lend themselves to this way of cultivation. In this way you can ensure a regular, fresh supply of vegetables that otherwise would perish quickly under storage conditions.
Other varieties that are prone to bolting (growing less leaves and moving into flower and seed production) such as rocket, spinach, broccoli, cilantro, basil, cabbage and lettuce especially need to be sown successionally.
If you sow the longer fruiting crops such as courgette, cucumbers and runner beans and sweet corn in two batches, spaced a few weeks apart, you can optimise produce availability well into the autumn.
There are four key methods for successional planting.
1) Same crop, staggered plantings.
Here you need to space out your plantings of the same crop, to around every 2-4 weeks, or when the plants from the preceding sowings are well developed, with four true leaves for leafy crops, or are around 5cm (2 inches) high in the case of peas or 10cm tall (four inches) for beans. Many vegetables put all their effort into producing a first flush of produce and then fade throughout the season, giving smaller and weaker yields. By employing a staggered approach, sowing more seeds as the first plants start to fade, you will ensure a regular supply of optimum produce over a longer period. Harvest mature, whole plants once they reach their peak. This will get light, water and space to neighbouring plants and make room for more sowings.
2) Different vegetables
Some crops like peas have a short growing season, so the area that they previously took up can be used to grow a later season plant like aubergine.
3) Shared space
Many a vegetable can be grown side by side quite well, and may even help to control pests. Try growing quick maturing radishes, which loosen the soil, ready for late sprouting carrots. Plus growing leeks or spring onions next to carrots may help to deter carrot fly. If you are really short of space, why not sow some veggies between your flowers in the borders. There are no rules to say you have to keep them separate and a few lettuce plants can look very good interspersed amongst the flowers.